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The Faithfull HSS taper drills are used for drilling sheet materials. They will drill a hole of any diameter between the stated sizes. Please note that use of a cutting fluid is advisable with this drill.The Faithfull FAITD412 taper drill is made from high speed steel (HSS) and has the following specifications:Drill sizes: 4 to 12mmAdditional Information:• Min. Size (mm): 4• Max. Size (mm): 12• Shank (mm): 6.5